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 determination that the host nation is unable or unwilling to suppress the threat posed by the individual targeted.

Were the target of a lethal operation a U.S. citizen who may have rights under the Due Process Clause and the Fourth Amendment, that individual’s citizenship would not immunize him from a lethal operation. Under the traditional due process balancing analysis of Mathews v. Eldridge, we recognize that there is no private interest more weighty than a person’s interest in his life. But that interest must be balanced against the United States’ interest in forestalling the threat of violence and death to other Americans that arises from an individual who is a senior operational leader of al-Q’aidaal-Qa’ida [sic] or an associated force of al-Q’aidaal-Qa’ida [sic] and who is engaged in plotting against the United States.

The paper begins with a brief summary of the authority for the use of force in the situation described here, including the authority to target a U.S. citizen having the characteristics described above with lethal force outside the area of active hostilities. It continues with the constitutional questions, considering first whether a lethal operation against such a U.S. citizen would be consistent with the Fifth Amendment’s Due Process Clause, U.S. Const. amend. V. As part of the due process analysis, the paper explains the concepts of “imminence,” feasibility of capture, and compliance with applicable law of war principles. The paper then discusses whether such an operation would be consistent with the Fourth Amendment’s prohibition on unreasonable seizures, U.S. Const. amend. IV. It concludes that where certain conditions are met, a lethal operation against a U. S. citizen who is a senior operational leader of al-Qa’ida or its associated forcesa terrorist organization engaged in constant plotting against the United States, as well as an enemy force with which the United States is in a congressionally authorized armed conflictand who himself poses an imminent threat of violent attack against the United States, would not violate the Constitution. The paper also includes an analysis concluding that such an operation would not violate certain criminal provisions prohibiting the killing of U.S. nationals outside the United States; nor would it constitute either the commission of a war crime or an assassination prohibited by Executive Order 12333.

The United States is in an armed conflict with al-Qa’ida and its associated forces, and Congress has authorized the President to use all necessary and appropriate force against those entities. See Authorization for Use of Military Force (“AUMF”), Pub. L. No. 107-40, § 2(a), 115 Stat. 224, 224 (2001). In addition to the authority arising from the AUMF, the President’s use of force against al-Qa’ida and associated forces is lawful under other principles of U.S. and international law, including the President’s constitutional responsibility to protect the nation and the inherent right to national self-defense recognized in international law (see, e. g., U.N. Charter art. 51). It was on these bases that the United States responded to the attack of September 11, 2001, and “[t]hese domestic and international legal authorities continue to this day.” Harold Hongju Koh, Legal Adviser, U.S. Department of State, Address to the Annual Meeting of the American Society of International Law: The Obama Administration and International Law (Mar. 25, 2010) (“2010 Koh ASIL Speech”).